<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>
<head>
    <title>Title</title>
</head>
<body>
   <form method="post" action="${pageContext.request.contextPath}/demo01">
        username:<input type="text" name="username">
        <input type="submit" value="提交">
   </form>
</body>
</html>
